Vacuum flask



FIG. 1 is a front elevational view of a vacuum flask showing my new design;

FIG. 2 is rear elevation view thereof.

FIG. 3 is a left side elevation view thereof.

FIG. 4 is a right side elevation view thereof.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a vacuum flask, as shown and described. 